DURACON® 45M: Typical Values and Heat Treatment
Properties of DURACON® 45M (typical values)
| Property | Unit | Base condition (martensitic) | Age hardend state (500°C/2H) | ||
| Tensile strength | Rm | 25 °C | MPa [=N/mm²] | 950 | 1300 |
| Yield strength | Rp0.2 | 25 °C | MPa [=N/mm²] | 700 | 1300 |
| Young's modulus | E | 25 °C | GPa [=kN/mm²] | 170 | 180 |
| Hardness | HV | 25 °C | 280 | 480 | |
| Hardness | HRC | 25 °C 200 °C 300 °C 400 °C | 28 | 48 44 42 40 | |
| Toughness at RT (Charpy Impact Test) | J | > 50 | 2,5 | ||
| Maximum application temperature | °C | ca. 350 | |||
| Density | ρ | g/cm³ | 8,3 | 8,3 | |
| Thermal expansion coefficient | α | 20–100 °C 20–400 °C | 10-6 1/K 10-6 1/K | 11,1 12,1 | 10,6 11,3 |
| Electrical conductivity | σ | 25 °C | m/Ωmm² | 10 | 12 |
| Thermal conductivity | λ | 25 °C 200 °C 400 °C | W/mK | 72 64 58 | 82 72 60 |
| Specific heat capacity | cp | 25 °C | J/(g∙K) | 0,43 | 0,43 |
| Ferromagnetism | Yes | Yes |
Heat treatment
The heat treatment (age hardening) at 500 °C can be done under protective atmosphere, or even at normal atmosphere if a slight oxide layer (about 1 µm) can be accepted.
Recommended procedure:
- quickly heat up to 500 °C (e. g. by putting the piece into a heated up furnace)
- protective atmosphere recommended, but not conclusive if a thin oxide layer can be allowed
- after the piece is heated through to 500 °C, the holding time is 2 hours
- after 2 hours the piece should be cooled down to about 200 °C in less than 2 hours, e. g. by taking the piece out of the furnace
- no enforced cooling or quenching required
Machining
In the delivery condition (not hardened) DURACON® 45M can be machined with most machining methods. Please note the tendency to produce endless chips when turning. When milling, higher wear on the cutting tool may have to be expected. Tests with wire eroding showed a reduced surface roughness compared with classic tool alloys. After hardening, DURACON® 45M is easy to polish.
